js_formatter.py contains the sublime textcommand for my plugin, which imports and runs jsbeautifier. jsbeautifier/__init__.py attempts to 'import jsbeautifier.unpackers', which fails, and is the real problem. The import fails on jsbeautifier/__init__.py line 255. If I fire up a python repl from the root of the plugin directory importing jsbeautifier or jsbeautifier.unpackers works as expected.

I have tried changing the import logic of my plugin as follows, but it has not resolved the problem: